List of practice Questions

Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta americana as it enters the animal body?
A wire of resistance $4 \, \Omega$ is stretched to twice its original length. The resistance of stretched wire would be :
During muscle contraction in humans, the
Dettol is the mixture of :
A metal has a $fcc$ lattice. The edge length of the unit cell is $404\, pm$. The density of the metal is $2.72\,g$ $cm^{-3}$. The molar mass of the metal is :
Cell-mediated immunity in the human body is carried out by
How many grams of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u) :
According to Darwin, the organic evolution is due to :
Product of sexual reproduction generally generates
What is the correct sequence of sperm formation?
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?
If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :
Down's syndrome in humans is due to
The pair of species that has the same bond order in the following is :
Nitrobenzene on reaction with conc. $ {HNO_3/H_2SO_4 }$ at $ {80-100^{\circ} C}$ forms which one of the following products ?
The value of acceleration due to gravity at the surface of earth
Which component of electromagnetic spectrum have maximum wavelength?
According to Bohr model of hydrogen atom, only those orbits are permissible which satisfy the condition
Identify $Z$ in the following sequence $CH _{3} CH _{2} I \xrightarrow{ KCN } X \xrightarrow{ H _{3} O ^{+} / H _{2} O } Y \xrightarrow[\Delta]{H_3O^+/H_2O}Z$
If two slits in Young's experiment are $ 0.4\,mm $ apart and fringe width on a screen $ 200\,cm $ away is $ 2\,mm $ the wavelength of light illuminating the slits is
A bar magnet of length '$l$' and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be
An equilateral triangle is made by uniform wires $AB, BC, CA. A$ current $I$ enters at $A$ and leaves from the mid point of $BC$. If the lengths of each side of the triangle is $L$, the magnetic field $B$ at the centroid $O$ of the triangle is
The term niche refers to
An electron of charge $e$ and mass $m$ is moving in circular path of radius $r$ with a uniform angular speed $\omega$. Then which of the following statements are correct ?
An alpha particle (He)has a mass of 4.00300 amu. A proton has mass of 1.00783 amu and a neutron has mass of 1.00867 amu respectively. The binding energy of alpha particle estimated from these data is the closest to